--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/html-validator.rst	Wed Oct 21 19:46:12 2015 +0300
@@ -0,0 +1,21 @@
+.. -*- coding: utf-8; -*-
+.. include:: HEADER.rst
+
+========================
+ HTML markup validator.
+========================
+.. contents::
+
+w3c online validators.
+======================
+
+ * http://validator.w3.org/unicorn/
+ * http://www.w3.org/developers/tools
+
+w3c-linkchecker.
+================
+::
+
+  $ sudo apt-get install w3c-linkchecker
+  $ checklink http://localhost
+